<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" />
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="rules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <!-- 密码 -->
         <el-form-item prop="password">
          <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item></el-form>
    </div>
  </div>
</template>

<script>
export default {
    data(){
        return{
            //这是登录表单的数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456',
            },
            //这是表单的验证规则对象
            rules:{
                //验证用户名是否合法
                username:[
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
                ],
                //验证密码是否合法
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ],
                
            },
        };
    },
    methods:{
        //点击重置按钮，重置登录表单
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();//resetFields()对该表单项进行重置，将其值重置为初始值并移除校验结果
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
               if(!valid) return;
              const {data:res} =await this.$http.post('login',this.loginForm);
              //将请求到的数据对象中的data属性去除重命名为res
              //console.log(res);
              if(res.meta.status!==200)return this.$message.error("登陆失败")
              this.$message.success('登陆成功')
              //将token保存到session中
              window.sessionStorage.setItem('token',res.data.token);
              this.$router.push('/home')
              //如果用户没有登录，但是直接通过URL访问特定页面需要重新导航到登录页，
              //路由导航守卫控制访问权限
            })
        }
    }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  /* 移动相对于自身宽高的百分之50 */
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: antiquewhite;
  }
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
}
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>